I shoot 3 1/8 to 3 1/4 dram loads through both my Benelli M1 and SBE II withoug problem. They recommend not using "light" loads, because the interia system does required a certain amount of recoil to function properly. Benelli also recommends in the user manual to shoot the first 4 to 5 boxes of "standard" load (heavier) for the break in period, before you, if you choose, go to something a little lighter.